diff options
| author |   Minchan Kim <minchan@kernel.org> | 2014-01-30 15:46:03 -0800 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@linux-foundation.org> | 2014-01-30 16:56:55 -0800 |
| commit | 92967471b67163bb1654e9b7fe99449ab70a4aaa (patch) | |
| tree | 440e10b86af31f9752585f2472a382d0b36611d4 /drivers/block/zram/zram_drv.h | |
| parent | zram: use atomic operation for stat (diff) | |
| download | linux-dev-92967471b67163bb1654e9b7fe99449ab70a4aaa.tar.xz linux-dev-92967471b67163bb1654e9b7fe99449ab70a4aaa.zip | |
zram: introduce zram->tb_lock
Currently, the zram table is protected by zram->lock but it's rather
coarse-grained lock and it makes hard for scalibility.
Let's use own rwlock instead of depending on zram->lock. This patch
adds new locking so obviously, it would make slow but this patch is just
prepartion for removing coarse-grained rw_semaphore(ie, zram->lock)
which is hurdle about zram scalability.
Final patch in this patchset series will remove the lock from read-path
and change rw_semaphore with mutex in write path. With bonus, we could
drop pending slot free mess in next patch.
Signed-off-by: Minchan Kim <minchan@kernel.org>
Cc: Nitin Gupta <ngupta@vflare.org>
Tested-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Cc: Jerome Marchand <jmarchan@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to '')
| -rw-r--r-- | drivers/block/zram/zram_drv.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/block/zram/zram_drv.h b/drivers/block/zram/zram_drv.h index 81b0170de369..c3f453f04974 100644 --- a/drivers/block/zram/zram_drv.h +++ b/drivers/block/zram/zram_drv.h @@ -83,6 +83,7 @@ struct zram_stats { }; struct zram_meta { + rwlock_t tb_lock; /* protect table */ void *compress_workmem; void *compress_buffer; struct table *table; @@ -96,7 +97,7 @@ struct zram_slot_free { struct zram { struct zram_meta *meta; - struct rw_semaphore lock; /* protect compression buffers, table, + struct rw_semaphore lock; /* protect compression buffers, * reads and writes */ |